Place the following events in the sexual reproduction life cycle of a mushroom (*Agaricus*) in the correct chronological sequence from initial hyphal interaction to spore germination.
- 1Hyphal fusion (plasmogamy) between compatible monokaryotic mycelia to form a dikaryotic mycelium
- 2Growth and differentiation of the dikaryotic basidiocarp (fruiting body)
- 3Nuclear fusion (karyogamy) within basidia located on the gill surfaces
- 4Meiotic division of the diploid nucleus producing four haploid basidiospores
- 5Discharge of basidiospores and subsequent germination into new primary monokaryotic mycelia
Answer
The correct chronological sequence of events in the sexual reproduction of *Agaricus* is: (1) Hyphal fusion (plasmogamy) between compatible monokaryotic mycelia to form a dikaryotic mycelium, (2) Growth and differentiation of the dikaryotic basidiocarp (fruiting body), (3) Nuclear fusion (karyogamy) within basidia located on the gill surfaces, (4) Meiotic division of the diploid nucleus producing four haploid basidiospores, and (5) Discharge of basidiospores and subsequent germination into new primary monokaryotic mycelia.
In the life cycle of the mushroom (*Agaricus*), sexual reproduction begins when two compatible monokaryotic hyphae undergo plasmogamy (cytoplasmic fusion) to yield a dikaryotic mycelium. This dikaryotic mycelium grows and develops into the macroscopic basidiocarp (mushroom). Within the microscopic basidia on the gills, karyogamy (nuclear fusion) occurs, creating a diploid nucleus. This nucleus undergoes meiosis to form four haploid basidiospores, which are eventually shed and germinate into new monokaryotic primary mycelia.
Step-by-Step Solution
Key Concept
Life cycle of Basidiomycetes: Plasmogamy, Dikaryotic basidiocarp growth, Karyogamy, Meiosis, and Spore germination
Estimated Time:2m 0s